해상에서 VIE 추적 조사에 의한 양성 기구의 수용 밀도 및 개체 크기별 해삼 (Apostichopus japonicus , Selenka)의 성장 비교
Growth of sea cucumber (Apostichopus japonicus, Selenka) to different stocking densities and body sizes, with monitoring and the use of VIE tags
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초록
이 연구에서는 수온의 변화에 따른 해삼 양성 기구의 적정 입식 밀도를 구명하기 위하여 해삼 양성 기구의 단위 면적당 해삼의 초기 수용 밀도를 달리하고 해삼의 표피에 VIE 표지를 주입한 해삼을 대상으로 해상에서 70일간 추적 조사를 실시하여 해삼의 생존율과 성장률을 조사하였다. 먼저, 실험 해역의 수온인 19.75℃∼5.43℃의 범위 중 수온 11℃에서 해삼의 성장률이 0.58% day-1로 나타나 겨울철 해삼의 성장에 적합한 임계 수온이 11℃임을 확인하였다. 그리고 해삼이 성장함에 따라 변화하는 입식 밀도의 영향에 대해 분석한 결과, 해삼 개체 크기에 관계없이 초기 입식 밀도(150∼600 g/m2)에서 80∼100 g/m2만큼 증가하면, 해삼의 SGR은 0.56% day-1로 증가하였다. 또한 해삼의 개체 크기별 입식 밀도의 영향을 분석한 결과, 소형 및 중형 그룹 개체의 경우 초기 입식 밀도에서 80 g/m2만큼 증가하면 해삼의 SGR이 각각 0.71과 0.46% day-1로 증가하였고, 대형 그룹 개체의 경우 입식 밀도가 100 g/m2만큼 증가하면 SGR이 0.51% day-1로 나타났다. 따라서 소형 개체의 해삼은 중형 및 대형 개체보다 수온 및 입식 밀도 변화와 같은 요인들의 영향에 더 민감하게 반응을 하였으므로 금후 이 부분에 대해서는 좀 더 나은 연구가 요구된다.
Abstract
The objective of this study was to investigate the growth rate and the optimal stocking density of sea cucumbers. Grow-out was studied in situ by conducting a follow-up survey using visible implant elastomer (VIE) tags. The rearing systems were made of polypropylene pipe for the frames and netting. The experiment ran for 70 days near Yeosu, Korea in the water depth of about 7 m. A total of 576 sea cucumbers which have three groups of body sizes (small: 5.15, medium: 12.34 and large: 23.26 g) were used. The five groups of stocking densities (150, 300, 450, 600 and 850 g/m2) in rearing system for sea cucumber were considered. Sea cucumbers were fed a mixed diet (mud, mineral, fish meal, etc.). The feed was supplied to 10% of their body wet weight once every 7 days. The survival rate (73%) of sea cucumber in 850 g/m2 was lower than those of other density groups (150 g/m2: 89%, 300 g/m2: 84%, 450 g/m2: 78% and 600 g/m2: 86%). The survival rate of medium size group was higher than those of small and large groups regardless of the density (P<0.05). Most of density groups have no significant difference except for 850 g/m2 (P>0.05). The growth rate of small size group (0.63% day-1) was higher than those of medium (0.38% day-1) and large (0.34% day-1) group regardless of the density (P<0.05). The threshold water temperature was 11.0℃ for sea cucumber growth in winter season.
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